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A population consist of multiple of five numbers where is 5, 10, 15, 20, 25, and 30 with sample size of 2. Find the population variance.

Question

A population consist of multiple of five numbers where is 5, 10, 15, 20, 25, and 30 with sample size of 2. Find the population variance.

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Solution

To calculate the population variance, follow these steps:

  1. Calculate the mean (average) of the population. Add all the numbers together and divide by the number of numbers.

    (5 + 10 + 15 + 20 + 25 + 30) / 6 = 17.5

  2. Subtract the mean from each number in the population and square the result. This is called the "squared difference".

    (5 - 17.5)^2 = 156.25 (10 - 17.5)^2 = 56.25 (15 - 17.5)^2 = 6.25 (20 - 17.5)^2 = 6.25 (25 - 17.5)^2 = 56.25 (30 - 17.5)^2 = 156.25

  3. Add all the squared differences together.

    156.25 + 56.25 + 6.25 + 6.25 + 56.25 + 156.25 = 437.5

  4. Divide the sum of the squared differences by the number of numbers in the population to get the variance.

    437.5 / 6 = 72.92

So, the population variance is 72.92.

This problem has been solved

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